Allow VideoCaptureImpl to suspend/resume frame delivery to its client.

content/renderer/media/video_capture_impl_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/video_capture_impl_manager.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "content/renderer/media/video_capture_impl.h"
 #include "content/renderer/media/video_capture_message_filter.h"
@@ skipping 19 matching lines @@
         new VideoCaptureImpl(id, message_loop_proxy_, filter_);
     devices_[id] = new Device(vc, handler);
     vc->Init();
     return vc;
   }
 
   devices_[id]->clients.push_front(handler);
   return it->second->vc;
 }
 
+void VideoCaptureImplManager::SuspendDevices(bool suspend) {
+  base::AutoLock auto_lock(lock_);
+  for (Devices::iterator it = devices_.begin(); it != devices_.end(); ++it) {

[qinmin, 2013/04/16 04:06:17]

no need for {}

[wjia(left Chromium), 2013/04/16 16:44:05]

Done.

+    it->second->vc->SuspendCapture(suspend);
+  }
+}
+
 void VideoCaptureImplManager::RemoveDevice(
     media::VideoCaptureSessionId id,
     media::VideoCapture::EventHandler* handler) {
   DCHECK(handler);
 
   base::AutoLock auto_lock(lock_);
   Devices::iterator it = devices_.find(id);
   if (it == devices_.end())
     return;
 
@@ skipping 23 matching lines @@
 VideoCaptureImplManager::Device::Device(
     VideoCaptureImpl* device,
     media::VideoCapture::EventHandler* handler)
     : vc(device) {
   clients.push_front(handler);
 }
 
 VideoCaptureImplManager::Device::~Device() {}
 
 }  // namespace content